Pound-for-pound boxing king Floyd Mayweather will step back into the ring on September 13 when he faces Marcos Maidana in a repeat of their May 4 bout.

Mayweather confirmed that he would be stepping into the ring for a second time with the 30-year-old Argentine, once again at the MGM Grand Garden in Las Vegas - Mayweather's 10th successive fight at the venue.

And while a rematch has been mooted since their first bout, Mayweather's father, Floyd Mayweather Snr, has criticised his son's decision - declaring Maidana is "not even worth fighting to be honest."

In an interview with On The Ropes Boxing, Mayweather Snr declared: "I wouldn't like to see him fight Maidana – not that he can't beat Maidana, but Maidana does too much dirty s**t and his corner is dirty.

"His corner told him to do this s**t, they told him, 'hey fight dirty, so whatever it takes to win.'

"That's what they said, those were their words. I'm just saying, he's not even worth fighting to be honest."

Check out all the pics from the last Mayweather-Maidana encounter below: